1 /*
   2  * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 import java.io.ByteArrayOutputStream;
  25 import java.io.InputStream;
  26 import java.io.IOException;
  27 
  28 /*
  29  * @test
  30  * @bug 4358774
  31  * @summary Check for expected behavior of InputStream.nullStream().
  32  */
  33 public class NullInputStream {
  34     public static void main(String[] args) throws IOException {
  35         int failures = 0;
  36 
  37         InputStream in = InputStream.nullStream();
  38         if (in == null) {
  39             throw new RuntimeException
  40                 ("InputStream.nullStream() returned null");
  41         }
  42 
  43         if (in.available() != 0) {
  44             System.err.println("available() != 0");
  45             failures++;
  46         }
  47 
  48         if (in.read() != -1) {
  49             System.err.println("read() != -1");
  50             failures++;
  51         }
  52 
  53         if (in.read(new byte[1]) != -1) {
  54             System.err.println("read(byte[]) != -1");
  55             failures++;
  56         }
  57 
  58         if (in.read(new byte[1], 0, 1) != -1) {
  59             System.err.println("read(byte[],int,int) != -1");
  60             failures++;
  61         }
  62 
  63         if (in.readAllBytes().length != 0) {
  64             System.err.println("readAllBytes().length != 0");
  65             failures++;
  66         }
  67 
  68         if (in.readNBytes(new byte[1], 0, 1) != 0) {
  69             System.err.println("readNBytes(byte[],int,int) != -1");
  70             failures++;
  71         }
  72 
  73         if (in.transferTo(new ByteArrayOutputStream(7)) != 0) {
  74             System.err.println("transferTo() != 0");
  75             failures++;
  76         }
  77 
  78         if (in.skip(1) != 0) {
  79             System.err.println("skip() != 0");
  80             failures++;
  81         }
  82 
  83         in.close();
  84         try {
  85             in.available();
  86             System.err.println("No IOException from available() after closing");
  87             failures++;
  88         } catch (IOException e) {
  89         }
  90         try {
  91             in.read();
  92             System.err.println("No IOException from read() after closing");
  93             failures++;
  94         } catch (IOException e) {
  95         }
  96         try {
  97             in.read(new byte[1], 0, 1);
  98             System.err.println("No IOException from read(b,i,i) after closing");
  99             failures++;
 100         } catch (IOException e) {
 101         }
 102         try {
 103             in.readAllBytes();
 104             System.err.println("No IOException from readAllBytes() after closing");
 105             failures++;
 106         } catch (IOException e) {
 107         }
 108         try {
 109             in.readNBytes(new byte[1], 0, 1);
 110             System.err.println("No IOException from readNBytes() after closing");
 111             failures++;
 112         } catch (IOException e) {
 113         }
 114         try {
 115             in.skip(1);
 116             System.err.println("No IOException from skip() after closing");
 117             failures++;
 118         } catch (IOException e) {
 119         }
 120         try {
 121             in.transferTo(new ByteArrayOutputStream(7));
 122             System.err.println("No IOException from transferTo() after closing");
 123             failures++;
 124         } catch (IOException e) {
 125         }
 126 
 127         if (failures != 0) {
 128             throw new RuntimeException("Test failed");
 129         }
 130     }
 131 }